Stevia(Stevia rebaudiana Bertoni)에 있어서 施肥에 依한 主要形質의 變異에 관한 硏究 = A Study on the Variability of Agronomic Characters by Fer tilizer Application in Stevia rebaudiana Bertoni

다국어 초록 (Multilingual Abstract)

This study was conducted to obtain some information on the environmental variation of
agronomic characters in Stevia rebaudiana Bertoni at Seogwipo. Nitrogen and Potassium were
applied at four levels 0, 5, 10 and 15kg/10a and phosphorus was applied at five levels 0, 7.5, 15, 22. 5
and 30kg/10a.
The results obtained are summarized as follows;
As the amount of nitrogen was increased, the plant height, the number of branches, the
fresh weight, the dry weight of plant, the dry weight of leaf and the dry weight of stem also
increased.
The effect of nitrogen was significant at 10kg/10a level but showed a decrease at the higher
level.
Applications of 5 and 10kg/10a potassium were effective in increasing the yield and the other
characters and no significant difference was found between them.
The yield showed no further increase above the marginal amount of potassium.
The characters of stevia increased with increasing the amount of phosphorus but the effect
of phosphorus was not remarkable compared with nitrogen or potassium.
It was observed that the application of 10kg nitrogen, 7.5kg phosphorus and 5kg potassium
per 10are favoured the yield of stevia.
The yield or dry leaf weight was positively correlated with the number of branches, the
fresh weight of plant, the dry weight of plant and the dry weight of stem.
The plant height did not show relationship with any character.
There were highly significant correlations between the dry weight and the fresh weight of
plant, between the stem weight and the fresh weight or the dry weight of plant.